Continuous feeder for dual drum type breaker mills



Sept. 23, 1958 J. A. PLIMPTON CONTINUOUS FEEDER FOR DUAL DRUM TYPE BREAKER MILLS JOHNA.PLIMPTON ATTORNEY Sept. 23, 1958 .1. A. PLIMPTONI CONTINUOUS FEEDER FOR DUAL DRUM TYPE BREAKER MILLS 3 Sheets-Sheet 2 Filed May 15, 1956 FIG.

INVENTOR JOHN R. PLIMPTON ATTORNEY Sept. 23, 1958 J. A. PLIMPTON 2,853,244

CONTINUOUS FEEDER FOR DUAL DRUM TYPE BREAKER MILLS Filed May 15, 1956 3 Sheets-Sheet 3 FIG. 3.

INVENTOR JOHN FLPLIMPTON ATTORNEY United States Patent "ice CONTINUOUS FEEDER FOR DUAL DRUM TYPE BREAKER MILLS John A. Plimpton, Mansfield Centre, Conn.

Application May 15, 1956, Serial No. 584,982

7 Claims. (Cl. 241-135) This invention relates to apparatus for reducing the size or bulk of earthy materials, and more particularly to an improvement in feeders for mills of the dual cylinder or drum type wherein the material enters medially and is directed into opposite sections of the mill.

A primary object of the invention is to provide, in a mill of the type described, a construction which will effectively cause continuous division or dispersion of material into two constantly flowing streams, thereby obviating carry-over of partial increments of material as well as uneven amounts or surges often caused by alternate pocket type feeders.

A further object of the invention is to provide a feeding means that not only augments the capacity of the mill but results in simpler construction, easier maintenance; more efficient screening; the capacity to more readily handle tramp iron or other refuse; increased vertical drop; and allowing the material to be deposited on the screen section nearest the middle so that it will have maximum travel over the screen before being discharged at the ends.

With the above and other objects in view which will more readily appear as the nature of the invention is better understood, the same consists in the novel construction, combination, and arrangement of parts hereinafter more fully described and illustrated in the accompanying drawings, in which:

Fig. 1 is a more or less diagrammatic longitudinal sectional view of a mill including the present feeding means.

Fig. 2 is a vertical cross section taken on the line 2-2 of Fig. l.

F g. 3 is a perspective View of the feeder unit.

Fig. 4 is a diagrammatic illustration of the application of the invention to another type of crushing apparatus.

Similar reference numerals designate corresponding parts throughout the several figures of the drawing.

As will be seen from Fig. l, the feeding means designated generally as F is located beneath a single feed chute C disposed medially of the machine contained within a casing C. This machine includes the opposite work chambers formed by the drums or cylinders A-B, which,.for example, are provided with an interior screen B supported by longitudinally disposed beams D. These beams are arranged in circumferentially spaced relation and connected at their ends by frames EE' having stub shafts suitably journalled in bearings GG'. The stub shafts are provided with driving connections H so that the entire structure including the drums AB may be rotated in a conventional manner, and to that extent the machine can be considered as a single drum having adjacent work chambers. The drum sections AB may be provided with suitable hammer units diagrammatically shown at K for breaking up the material supplied to the machine by the feeding means F. The material that does not pass through the screen makes its exit at the ends of the drums in a manner well known in the art 2,853,244 Patented Sept. 23, 1958 as shown in the patent to Danyluke, No. 2,708,075, dated May 10, 1955.

The distinguishing characteristic of the feeding means F is that it does not rotate with the cylinders or drums, but remains relatively stationary and in receiving relation to the chute C so that material passing therethrough is split or divided in a manner to be directed in opposite directions to the interior of the cylinders or drums AB.

As will be seen from the drawing the medial portion of the apparatus is provided with the spaced rings 1-2 which are supported on and carried by the beams D. These rings define the inner walls of the rotatable drum sections AB and the feeding means F is freely supported on shafts therebetween. That is to say, the feeding means, later to be described in greater detail is axially carried by and hangs from said shaft whose ends are supported by a pair of oppositely disposed spiders 34. The ends of the arms of the spiders are secured to appropriate beams D. As will be observed from Fig. 2, the said arms are disposed approximately at an angle of 120 relative to each other so as to provide minimum resistance to material directed by the feeding means F into the drum sections AB.

The feeding means F includes the opositely located side members including special feeding and directing surfaces designated generally as 5--6. As will presently appear these are compound surfaces and the upper portions thereof as viewed edge-wise are of substantially pyramidal shape while in end elevation they are of generally circular or disc-like formation. These side members are contained within a circumferentially disposed rim plate 7 whose transverse width is sufficient to project into the inner openings of the rings 12 to prevent material escaping from between the bottom portion of the rings and assuring its deposit in the opposite drums. The upper portions 89 of the plate are flared outwardly radially of the axis of the disc-like body of the feeding means thereby to receive and direct material flowing from chute C against the surfaces 56. The parts 8 and 9 are preferably reinforced by the struts 7 1 As will appear more clearly from Fig. 2 the opposite outer faces S-6 include a main conic receiving and material splitting section 10 covering an area of approximately which is a portion of a true cone between its periphery and axis. The opposite edge portions of the initial feeding section 10 are flanked by the downwardly directed material shedding sections 1111 each also extending over an area of approximately 100 until they merge with the flat face 12 which covers a sector of apporixmately 60. All of the surfaces 10, 11, 12 lie within the opposite edges of the plate 7 and the edges of the latter overlap the rings 1 and 2.

Since the feeding means F consisting of the structural features above-described is freely mounted on shaft S between the spider arms 34, it will always tend to remain in the position shown in Figs. 1 and 2 with the crest ofits pyramidal portion projecting midstream into the material flow passing from the chute between the upper portion of the rotating rings 1--2. The inertia of the feeding means will normally be sufficient to enable it to maintain an upright position, but if desired, the lower portion may be loaded or weighted if the materials to be handled so require.

Although the feeding means F remains stationary While the drums rotate, it will be apparent that if pieces of tramp iron or other foreign material should come between contiguous surfaces of the portions 10 or 11 and the inner periphery of the rings 1 and 2 and/ or arms of spider 3 and 4, the feeding means may yield and by a rocking movement dislodge the tramp material.

The surfaces 10, 1ll11 and 12 provide, in effect a continuation of the chute C and insure the dispersion and division of material in such a manner that it is distributed relatively close to the drum sides of the rings 1-2. The fact that edge portions of the plate 7 extend into the inner openings of the rings 1-2 effectively prevents the lay-passing or accidental escape of material passing the feeding means and insures positive direction into the drums AB at all times. The surfaces 1010 and 11-11 constitute oppositely inclined continuations of the chute C at either side of the apex or crest of the unit and cooperate with contiguous portions of the inner edges of the rings 1 and 2 to provide material flowing passages. The flat sections 12 at each side of the feeding means contribute an obturating effect which will restrain material which might bounce on the screens and otherwise tend to escape proper screening.

By way of illustrating the application of the invention to other types of crushing apparatus reference may be made to Fig. 4. For example, the present invention makes it possible to convert the mill of the Borton patent, 2,108,793, dated February 22, 1938, into a tandem mill with center feed as distinguished from the end feed shown in the patent. In Fig. 4, the feeder F is mounted between the drum' sections A and B each containing hammer units K all driven by a common shaft S In this case the medial portion of the shaft is journalled in the spiders 3 and 4 and centrally coupled as indicated at S and the feeder hangs on the portions of the shaft between the spiders in the same fashion as previously described.

I claim:

1. A crushing and screen apparatus comprising, in combination, a rotatable material working drum including' spaced longitudinally aligned sections, a single material supplying chute of substantially the same width as the space between said sections and in open communication at its lower end with both sections, and a material directing and feeding device located in said space and supported in the inner ends of said sections at a relatively stationary position with respect thereto and within the circumferential area of the sections, said device having a material diverting edge and diverging surfaces contiguous thereto and in the path of flow of material for continuously dividing and directing the material from said chute to the inner portions of the sections of said drum.

2. In a crushing and screening apparatus, the combination comprising, means forming opposite rotatable work chambers and including spaced medially disposed rings having their outer peripheries extending beyond the circumference of the work chambers and their inner edges disposed within said work chambers, a relatively stationary material feeder unit supported between the 4. rings and having at opposite edges thereof portions which overlap the inner edges of the rings, and also having opposite downwardly inclined material flowing surfaces for directing and distributing the material into said chambers, and a chute discharging onto said unit.

3. In a crushing and screening apparatus, the combination comprising, a pair of work drums supported together for rotation, spaced rings secured to the inner ends of said drums, a shaft, means at the outer sides of said rings and secured to said drums for supporting said shaft, a feeding unit hung from said shaft to remain relatively stationary while the drums rotate, said feeding unit including material directing surfaces at opposite sides thereof inclined downwardly from an apical portion toward said drums, and a plate extending partially around said periphery and terminating in radially disposed spaced wings for gathering material onto said directing surfaces.

4. A crushing and screening apparatus according to claim 3, wherein the material directing surfaces are composed of an upper substantially conic receiving sector, contiguous downwardly inclined intermediate sectors, and a flat vertical bottom sector, said bottom sector being contiguous with said intermediate sectors.

5. A crushing and screening apparatus according to claim 3, wherein, the plate is coextensive with the spacing of the rings and the edges thereof overlap the inner edges of the rings.

6. A crushing and screening apparatus according to claim 3, wherein, the means for supporting the shaft is in the form of a pair of spiders whose arms are approximately apart and the extremities of which are secured to the drums.

7. In a crushing-and screening apparatus, the combination comprising, a pair of work drums supported together for rotation, spaced rings secured to the inner ends of said drums, a shaft, means at the outer sides of said rings and secured to said drums for supporting said shaft, a feeding unit hung from said shaft to remain relatively stationary while the drums rotate and comprising material directing surfaces at opposite sides thereof inclined downwardly from an apical portion of said unit toward said drums to provide passageways leading thereto, and a plate extending partially around said periphery and terminating in radially disposed spaced wings for gathering material onto said directing surfaces.

References Cited in the file of this patent UNITED STATES PATENTS 1,261,398 Janney Apr. 2, 1918 1,627,488 Crowe May 3, 1927 2,708,075 Danyluke May 10, 1955 

